How a DSCR Loan Handles Vacancy in Its Revenue Assumption
A DSCR loan doesn't assume full occupancy every month. Underwriting applies a vacancy or usage factor — discounting gross potential revenue to a realistic operating figure — before dividing by PITIA. Skipping that discount is the single most common way investors overestimate their own qualifying ratio.
NightYield Editorial
STR-DSCR research & underwriting desk
Published 2026-07-16
Why the gross number is never the qualifying number
Gross potential rent — what a unit could earn if occupied every single day or month of the year — is a ceiling, not a realistic operating assumption. Every occupied-rental underwriting method, long-term or short-term, discounts that ceiling down before it's used to compute anything.
For a long-term rental, this typically shows up as a vacancy and collection loss factor applied against gross monthly rent — accounting for turnover periods between tenants and the reality that not every month collects in full. For a short-term rental, the discount is baked directly into the revenue projection itself: an AirDNA or Rabbu-style estimate, or an appraisal Form 1007/1025 comparable-rent figure, already reflects a realistic occupancy rate rather than 365 nights booked.
Worked example: the gap between gross and qualifying revenue
On the STR side, the same principle applies through the projection method itself rather than a separate factor: a market-comp revenue tool or appraisal projection is already built around a realistic booking calendar, not a fully booked one. Treating a market's peak-season nightly rate times 365 as the annual figure — instead of using the actual projection tool's blended annual number — is the fastest way to overstate qualifying revenue on an STR deal.
- Start from the actual projection source — an AirDNA/Rabbu-style comp report or the appraisal's Form 1007/1025 figure — not a peak-rate extrapolation.
- For long-term rentals, confirm whether the lender applies its own vacancy factor on top of the stated rent, or whether the comparable rent figure already reflects one.
- Divide the discounted, realistic revenue figure by PITIA — never the undiscounted gross.
- Compare that ratio to the lender's DSCR floor before assuming a deal qualifies.
Why this matters before you run the numbers yourself
Investors doing back-of-envelope math on a new deal often start from an optimistic gross figure — a peak monthly rent, a best-case nightly rate — and get a DSCR that looks stronger than what underwriting will actually produce. Building the vacancy or usage discount into your own pre-qualification math avoids a surprise at the underwriting stage.
Key takeaways
- DSCR underwriting never uses fully-booked gross revenue as the qualifying figure.
- Long-term rentals apply an explicit vacancy and collection-loss factor to gross rent.
- Short-term rental projections build in realistic occupancy through the comp or appraisal method itself.
- Running your own pre-qualification math on a discounted, realistic revenue figure avoids overestimating your DSCR.